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include/swiftmailer/lib/preferences.php

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+<?php
+
+/****************************************************************************/
+/*                                                                          */
+/* YOU MAY WISH TO MODIFY OR REMOVE THE FOLLOWING LINES WHICH SET DEFAULTS  */
+/*                                                                          */
+/****************************************************************************/
+
+$preferences = Swift_Preferences::getInstance();
+
+// Sets the default charset so that setCharset() is not needed elsewhere
+$preferences->setCharset('utf-8');
+
+// Without these lines the default caching mechanism is "array" but this uses a lot of memory.
+// If possible, use a disk cache to enable attaching large attachments etc.
+// You can override the default temporary directory by setting the TMPDIR environment variable.
+if (@is_writable($tmpDir = sys_get_temp_dir())) {
+    $preferences->setTempDir($tmpDir)->setCacheType('disk');
+}